Numerical Study of High-Temperature Air Combustion Using Different Jet Nozzle

2011 ◽  
Author(s):  
Cui-wu Chen ◽  
Ya-xin Su ◽  
Hao Cheng
Keyword(s):  
High Temperature ◽  
Numerical Study ◽  
High Temperature Air Combustion ◽  
Jet Nozzle

Numerical Study on High Temperature Air Combustion in U-Type Tube

2008 ◽  
Author(s):  
Xing Li ◽  
Li Jia ◽  
Tiantian Zhang ◽  
Lixin Yang
Keyword(s):  
High Temperature ◽  
Natural Gas ◽  
Combustion Chamber ◽  
Numerical Study ◽  
Maximum Temperature ◽  
No Emission ◽  
High Temperature Air Combustion ◽  
Average Temperature ◽  
Combustion Technology ◽  
Type Tube

In this paper, the combustion characteristics of natural gas with high-temperature air combustion technology in a U-type combustion chamber were investigated by the numerical method. The results of the CFD-based mathematical modeling of rated condition were compared with experimental data including the maximum temperature, average temperature and NO emission. The research indicates that the combustion can be well simulated using the suggested numerical model. The temperature distribution, velocity distribution in the combustion chamber and NO emission were attained. In addition, the effects of some parameters such as oxygen concentration, excessive air ratio and combustion air temperature were discussed in detail. It provided primarily theoretic basis for further study of natural gas high temperature air combustion.

scholarly journals Numerical Study of NOx Emission in High Temperature Air Combustion.

1998 ◽  
Vol 41 (2) ◽  
pp. 331-337 ◽  
Author(s):  
Hongsheng GUO ◽  
Yiguang JU ◽  
Kaoru MARUTA ◽  
Takashi NIIOKA ◽  
Jun'ichi SATO
Keyword(s):  
High Temperature ◽  
Numerical Study ◽  
Nox Emission ◽  
High Temperature Air Combustion

Numerical Study on NO Mechanism during High Temperature Air Combustion of Natural Gas

2012 ◽  
Vol 190-191 ◽  
pp. 609-614
Author(s):  
Ya Xin Su ◽  
Cui Wu Chen
Keyword(s):  
High Temperature ◽  
Natural Gas ◽  
No Reduction ◽  
Numerical Study ◽  
Combustion Process ◽  
Combustion Model ◽  
Small Contribution ◽  
High Temperature Air Combustion ◽  
Intermediate Model ◽  
No Formation

A full nitric oxide mechanism including thermal NO, prompt NO, N2O intermediate model and NO reduction model through reburning was used to calculate the NO formation during high temperature air combustion of natural gas in industrial furnace. The turbulent transportation was simulated by Reynolds stress model (RSM) and a modified Eddy-Break-Up (EBU) combustion model was applied to model the combustion process. A three-step reaction scheme of the natural gas combustion reaction was considered. Experimental data from published literature was adopted to validate the present models. Numerical results showed that thermal NO formation mechanism and reburning NO reduction mechanism were the dominant NO models. Reburning NO reduction could not be ignored. Prompt NO gave a small contribution to NO emission and the N2O intermediate model for NO formation was of little importance.

scholarly journals Numerical Study on Damage Zones Induced by Excavation and Ventilation in a High-Temperature Tunnel at Depth

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4773
Author(s):  
Jianyu Li ◽  
Hong Li ◽  
Zheming Zhu ◽  
Ye Tao ◽  
Chun’an Tang
Keyword(s):  
High Temperature ◽  
Lateral Pressure ◽  
Numerical Study ◽  
Pressure Coefficient ◽  
Fracture Morphology ◽  
In Situ Stress ◽  
Surrounding Rock ◽  
Geothermal System ◽  
Mechanical Coupling ◽  
Lateral Pressure Coefficient

Geothermal power is being regarded as depending on techniques derived from hydrocarbon production in worldwide current strategy. However, it has artificially been developed far less than its natural potentials due to technical restrictions. This paper introduces the Enhanced Geothermal System based on Excavation (EGS-E), which is an innovative scheme of geothermal energy extraction. Then, based on cohesion-weakening-friction-strengthening model (CWFS) and literature investigation of granite test at high temperature, the initiation, propagation of excavation damaged zones (EDZs) under unloading and the EDZs scale in EGS-E closed to hydrostatic pressure state is studied. Finally, we have a discussion about the further evolution of surrounding rock stress and EDZs during ventilation is studied by thermal-mechanical coupling. The results show that the influence of high temperature damage on the mechanical parameters of granite should be considered; Lateral pressure coefficient affects the fracture morphology and scale of tunnel surrounding rock, and EDZs area is larger when the lateral pressure coefficient is 1.0 or 1.2; Ventilation of high temperature and high in-situ stress tunnel have a significant effect on the EDZs scale; Additional tensile stress is generated in the shallow of tunnel surrounding rock, and the compressive stress concentration transfers to the deep. EDZs experiences three expansion stages of slow, rapid and deceleration with cooling time, and the thermal insulation layer prolongs the slow growth stage.

High temperature air combustion boiler for low BTU gas

2002 ◽  
Vol 43 (9-12) ◽  
pp. 1563-1570 ◽  
Author(s):  
Kazuhiro Kawai ◽  
Kunio Yoshikawa ◽  
Hiromichi Kobayashi ◽  
Jeng-Syan Tsai ◽  
Mamoru Matsuo ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Air Combustion
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